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Ennery, nestled in the Artibonite Valley of Haiti (19.4834° N, 72.4854° W), occupies a geographically significant position within the nation’s agricultural heartland. The city’s terrain is predominantly flat, characteristic of the Artibonite River basin, with gentle slopes rising towards the surrounding hills. This low-lying topography, while facilitating agriculture, presents challenges for air quality dispersion. Ennery is situated close to the Artibonite River, a vital waterway for irrigation and transportation, and the presence of this large body of water can influence local humidity and temperature, impacting pollutant behaviour. The surrounding landscape is dominated by sugarcane fields and other agricultural lands, forming a strong urban–rural gradient. The Artibonite Valley is a major agricultural zone, and Ennery’s proximity to these fields means agricultural practices, including burning of crop residues after harvest, are a potential source of particulate matter. While Ennery isn't directly adjacent to a major industrial belt, its location within a region experiencing increasing economic activity means potential for localized industrial emissions exists, particularly related to sugar processing and related industries. The valley’s relatively enclosed nature, bounded by hills, can limit the effective dispersal of pollutants, especially during periods of low wind speed. The climate is tropical, with distinct wet and dry seasons, further influencing atmospheric stability and pollutant concentrations. The flat terrain and agricultural surroundings combine to create a unique environmental context where localized pollution sources can have a disproportionate impact on air quality.

Ennery’s tropical climate dictates a seasonal pattern in air quality, primarily driven by the interplay of wet and dry seasons. The dry season, typically spanning from December to April, often sees a noticeable increase in particulate matter. This is largely attributable to agricultural practices; the burning of sugarcane fields after harvest is a common, albeit environmentally impactful, method of land preparation. Reduced rainfall during this period also means less atmospheric cleansing through precipitation. The lack of consistent wind patterns during the dry season can exacerbate the issue, leading to pollutant accumulation. Conversely, the wet season (May to November) brings increased rainfall and higher humidity, which generally improves air quality by washing away particulate matter and increasing atmospheric moisture, which can trap some pollutants. However, periods of intense rainfall can also lead to flooding, potentially releasing pollutants from contaminated sites. Fog, a relatively infrequent occurrence, can form under specific meteorological conditions, trapping pollutants near the ground and creating localized pockets of poor air quality. Temperature inversions, where cooler air is trapped beneath warmer air, are less common but can occur, hindering vertical mixing and concentrating pollutants. During the transition months (April/May and November/December), air quality can be variable, influenced by the shifting weather patterns. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly when agricultural burning is prevalent, and avoid prolonged outdoor exposure during periods of stagnant air.